IMC 0609, App A - NRC

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Step Instructions Table 5 - Counting Rule Worksheet (1) Enter the number of sequences with a risk significance equal to 9. (1) (2) Divide the result of Step (1) by 3 and round down. (2) (3) Enter the number of sequences with a risk significance equal to 8. (3) (4) Add the result of Step (3) to the result of Step (2). (4) (5) Divide the result of Step (4) by 3 and round down. (5) (6) Enter the number of sequences with a risk significance equal to 7. (6) (7) Add the result of Step (6) to the result of Step (5). (7) (8) Divide the result of Step (7) by 3 and round down. (8) (9) Enter the number of sequences with a risk significance equal to 6. (9) (10) Add the result of Step (9) to the result of Step (8). (10) (11) Divide the result of Step (10) by 3 and round down. (11) (12) Enter the number of sequences with a risk significance equal to 5. (12) (13) Add the result of Step (12) to the result of Step (11). (13) (14) Divide the result of Step (13) by 3 and round down. (14) (15) Enter the number of sequences with a risk significance equal to 4. (15) (16) Add the result of Step (15) to the result of Step (14). (16) C If the result of Step 16 is greater than zero, then the risk significance of the inspection finding is of high safety significance (RED). C If the result of Step 13 is greater than zero, then the risk significance of the inspection finding is at least of substantial safety significance (YELLOW). C If the result of Step 10 is greater than zero, then the risk significance of the inspection finding is at least of low to moderate safety significance (WHITE). C If the result of Steps 10, 13, and 16 are zero, then the risk significance of the inspection finding is of very low safety significance (GREEN). Phase 2 Result: ~ GREEN ~ WHITE ~ YELLOW ~ RED 0609, App A, Att 1 A1-16 Issue Date: 12/01/04
Table of Contents APPENDIX A ATTACHMENT 2 Site Specific Risk-Informed Inspection Notebook Usage Rules 1.0DETERMINING THE INITIATING EVENT LIKELIHOOD ........................ A2-2 1.1Exposure Time ........................................................ A2-2 1.2Inspection Finding (Not Involving a Support System) that Increases the Likelihood of an Initiating Event ................................................................ A2-2 1.3Inspection Finding (Normally Cross-tied Support System) that Increases the Likelihood of an Initiating Event......................................................... A2-3 1.4Inspection Finding (Normally Running Components of a Split Train Support System) that Increases the Likelihood of an Initiating Event and the Impact on Mitigating System Capability Can Be Explicitly Determined ............................................. A2-3 1.5Inspection Finding (Normally Standby Components of a Split Train Support System) that Increases the Likelihood of an Initiating Event and the Impact on Mitigating System Capability Can Be Explicitly Determined ............................................. A2-4 1.6Inspection Findings Involving Emergency Diesel Generators ..................... A2-4 1.7Inspection Findings Involving Safety-Related Battery Chargers ................... A2-5 2.0 DETERMINING REMAINING MITIGATION CAPABILITY .................... A2-6 2.1Inspection Finding that Degrades Mitigation Capability and Does Not Reduce Remaining Mitigation Capability Credit to a Value Less Than Full Mitigation Credit ............. A2-6 2.2Inspection Finding (Normally Split Train Support System) that Does Not Increase the Likelihood of an Initiating Event and the Impact on Mitigating System Capability Can Be Explicitly Determined ........................................................... A2-6 2.3Inspection Findings Involving a Loss of Redundancy of Equipment ................ A2-7 2.4Inspection Findings Involving Equipment that Impact Operator Action Credit .................................................................... A2-7 3.0CHARACTERIZING THE RISK SIGNIFICANCE OF INSPECTION FINDINGS ....... A2-8 3.1Treatment of Shared Systems Between Units ................................ A2-8 3.2Counting Rule ......................................................... A2-8 Issue Date: 12/01/04 A2-1 0609, App A, Att 2
Page 1 and 2: I APPLICABILITY APPENDIX A Determin
Page 3 and 4: Phase 3 is intended to be performed
Page 5 and 6: APPENDIX A ATTACHMENT 1 User Guidan
Page 7 and 8: (1) For each of the inspection scen
Page 9 and 10: Human Reliability Analysis (HRA) Mo
Page 11 and 12: CORNERSTONES AND FUNCTIONS DEGRADED
Page 13 and 14: Initiating Events Cornerstone LOCA
Page 15 and 16: Row Initiating Event (IE) Frequency
Page 17 and 18: Affected System Major Components Su
Page 19: Recovery of Failed Train Table 4 -
Page 23 and 24: 1.3 Inspection Finding (Normally Cr
Page 25 and 26: first revision of the site specific
Page 27 and 28: Basis: Evaluation of this type of i
Page 29: these three accident sequences woul

IMC 0609, App A - NRC

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